Police said in a statement Monday they have investigated and dismissed Breivik's claims that the he is being held under illegal conditions.

Breivik earlier this month threatened to go on a hunger strike unless his conditions are improved. Among other things, he has complained about being kept in isolation and demanded access to better video games, a sofa and a larger gym.

The far-right fanatic is serving a 21-year prison sentence for murdering eight people in a bombing at the government headquarters and 69 more in a shooting spree at the left-wing Labor party's youth camp in 2011. His sentence can be extended for as long as he's considered dangerous.